Mechanic&#39;s square



Jan. 131 R. E. HOBBS MECHANIC sv SQUARE Filed Feb. 4. 1924 @HN-Enki @Wemag Patented Jan. 13, 1925. j

UNITED STATES PATENTv QFFICE.

.ROBERT EY HOBBS, F DETROIT, MICHIGAN.

iviiicHANIcs SQUARE.

Application led February 4, 1924. Serial No. 690,358.

To ZZ lwhom t may concern: said member iii-a selected position of rota- Be it known that I, ROBERT E. Hos, a tive adjustment. rlhis protractor feature is, citizen of the United States, residing at Dehowever, well-known and is not essential to troit, in the county of Wayne and State of the present invention. The member 4 has 5 Michigan, have invented new and useful an integral portion 9 positioned to form a (il) Mechanics Squares, of which the following chord to the circle formed by said member. is a specilication. Said chord portion at one end has its outer his invention relates to mechanics face raised slightly as indicated at to squares and more particularly to such provide a seat for the scale 3 at one side of squares having a removable scale. the binding screw 5, and a screw l1, thread- "i5 Repeated removals or longitudinal aded transversely through the other end porjustinents of the sca-le in such a tool results tion of the chord 9 terminally forms a comin a wear of the seat or seats against which panion seat for said scale upon the opposite the scale is clamped for use, and eventually side of said binding screw. l2 is a lock nut l5 results in a deviation of the scale from its upon the screw 1l, adapted to clamp upon T0 proper angular relation to the straight edge the inner face of the chord 9. or bearing surface of the square. In the use of the described invention when It is the object of the present invention to either or both of the seats l0 and 1l become provide the scale-holding member of a so worn due to repeated removals of the square with seats for clamping engagement scale 3 trom the member 4, or adjustments by the scale, `one of said seats being adjustof the scale longitudinally in said member, able upon said member to compensate for that any appreciable inaccuracy results in wear of the seats and to eliminate any inthe angular relation of the scale to the accuracy, resulting from such wear, in the straight edge 2, such inaccuracy is quickly angular relation of the scale and straight remedied by simply loosening the lock-nut S0 edge. l2 and turning the screw 11 until the proper In attaining this object, t-he invention position ofthe scale is re-established. When contemplates providing the scale holding the square is of a protractor type, such as member (which may, if desired, be rotative illustrated, the adjustment may be effected for protractor purposes) with seats for the by rotating the scale-holder 4 to a position 55 scale, one of which seats has the nature of indicating a zero angle, clamping said holda screw adjustable to and from the scale to er in such position by the set-screw 8, and vary the angular relation of the scale to then adjusting the screw l1 to establish the said member within such limits as may bev scale 3 in parallelism to the straight-edge 2.

3v necessary to correct inaccuracy due to wear llhat I claim is 9u either of the seat-forming face of said screw l. A mechanics square comprising a or of the fixed seat upon said member. frame having a straight edge, a scale, a scale A preferred embodiment of the invention holding member carried by the frame, havis hereinafter described and illustrated in ing an integral portion i'or seating the scale,

40 the accompanying drawing, wherein, and a companion seat member for the scale, 95

Fig. 1 is a view in side elevation of the" carried by said member and adjustable to improved scale. vary the angular relation oi' the scale to said Fig. 2 is a similar view, partly in section. member and to said straight edge. ln these views the reference character i 2. A mechanics square as defined in claim designates the frame ci' the square, said l, one of said seat members being a screw loo frame having the usual straight edge 2. 3' terminally bearingupon the scale. is the scale, and 4 a member to which said 3. A mechanics square comprising a scale is releasably secured for either removal frame having a straight edge, a scale, a or lengthwise adjustment, by the usual scale-holding member rotatably mounted in binding screw 5 engaged by a clamping nut said frame, means for clamping said mem- 105 6. As illust-rated, the kmember 4 is of the ber in a selective rotative position in said form of a ring and is rotatable for protracframe, clamping means securing said scale tor purposes in a circular opening 7 in the in the rotative member, and an element frame l, a set screw 8 being mounted in the mounted in the rotative member against frame radially toI the member 4 to clamp which said scale is clamped, said element ilo being adjustable to or from the scale to vary the angular relation of the Seal@ t0.- the 1f@- tatiye l'nfeinber and to said straight edge.

4. A. meehanics square comprising a scale holder having a straight edge, a scale oarried by said holder, 'Said holder having an integral seat for the scale, and a Companion seat for said scale adjustable in said holder to vary the angular relation of scale to the straight edge of said holder.

5.- A mehmcs Square Comprising a Scale a seale holder having a straight edge, clamping means releasably binding said scale upon said holder, said scale holder having a stationary bearing `for said scale at one side of the clamping ineans, and a Companion bearing at the opposite side of said clamping means adjnstably engageahle with said scale to regnlate the clamped relation thereof to the' Straight edge of said holder.

In testimony vwhereof sign this specification.

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